Rosemead, California

Rosemead, California Rosemead, California

What is the Water Quality in Rosemead, California?

[Updated: June 9, 2023]

Compared to other US cities, Rosemead water quality ranks in the very high range for contamination excluding Lead.

Most of their 43 contaminants have cancer-causing attributes.

  • Arsenic is at extremely high levels: 361x health guidelines.
  • Rosemead and El Monte also have PFOA and PFOS, “forever chemicals” with dangerous side effects.

Let’s look closer at what’s in Rosemead water.

What’s in Rosemead water?

Here are the top 5 chemical compounds in your water and what health issues they can potentially cause:

  1. Arsenic – Potential effect: Cancer
  2. Chloroform – Potential effect: Cancer
  3. Hexavalent Chromium – Potential effect: Cancer
  4. PFOA – Potential effect: Cancer
  5. Uranium – Potential effect: Cancer

These are five of the 43 contaminants analyzed by the Environmental Working Group (

12 of these contaminants are rated as exceeding EWG Health Guidelines.

Does Rosemead have Lead contamination?

Yes, Rosemead has lead in its water. The most recent Lead samples collected from 2015 through 2017 showed concentrations up to 1.4 parts per billion.

The legal limit for lead is 15 parts per billion. Being well-below this level is a good thing.

Concentrations between 3.8 ppb and 15 ppb put a formula-fed baby at risk of elevated blood lead levels. Read more about the symptoms of Lead in water.

There is no safe level of lead for humans.

The good news is that 99.99% of the lead can be filtered out.

See the What Can You Do? section below to learn how to filter out contaminants.

Where does Rosemead’s water come from?

Rosemead’s water comes from the Alhambra Wash – Rio Hondo watershed.

All 3 water sources in the Alhambra Wash – Rio Hondo watershed are in Impaired condition. These include:

  • Legg Lake
  • Rio Hondo Reach 1 (Confluence LA River to Santa Ana Freeway)
  • Rio Hondo Reach 2 (At Spreading Grounds)

Ideally, a water source would be rated in Good condition.

Learn more from How’s My Waterway

See below for what you can do to improve Rosemead’s water.

Conclusion – What Can You Do?

Information about water quality in Rosemead can be surprising.

But there are things you can do in your home to clean up your water.

  1. Test Your Water using Varify Home Test Kits or similar.
  2. To Remove Lead and Other Contaminants (including PFAS chemicals) In Your Home:
  • Use Activated Carbon filters to remove most contaminants in your drinking water.
    • Faucet-mount filters work better than pitchers.
    • PUR and Brita are low-cost and effective.
Brita Lead Filtration
Brita Faucet Mount – Amazon
  • To filter out even more contaminants in your whole house, consider a Reverse Osmosis water filtration system for your home.
    • These are typically more expensive than pitchers to purchase, but are much more effective.
    • They have the benefit of filtering out heavy hitters like:
      • Arsenic
      • 1,4-Dioxane
      • Chloroform
      • Chromium (hexavalent)
      • CObalt
      • Fluoride
      • NDMA
      • Nitrate
      • PFBS
      • PFDA
      • PFHPA
      • PFHxA
      • PFHXS
      • PFNA
      • PFOA
      • PFOS
      • Strontium
      • Uranium
    • Our recommendation: APEC Reverse Osmosis Systems
Reverse Osmosis Systems for Rosemead California
APEC system – Amazon

In Your Community:

Contact your local government officials and put pressure on them to invest in cleaner waterways and upgraded city water filtration and treatment.

Go to: to find contact information for your local officials.

Water Quality in Other California Cities

California Water Quality Page

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